Using target platform as a variable in compose file.

[wasabii]

I have an existing compose file which is somewhat like this:

services:
  asd-scheduler:
    image: asd/scheduler:${VERSION}
    build:
      context: ${BUILDDIR}/docker/${TARGETPLATFORM}/tmp/asdasd
      dockerfile: ${ROOTDIR}/src/asdasd/Dockerfile

The point here is that when building for a certain platform, I need to obtain completely different application files. So I change the context based on what platform I'm building for. Prevents copying a massive amount of useless stuff in.

Since buildx bake can now do this all on it's own, building for mulitple platforms, how can I have a variable available in this way? Is there any variable that can be used inside the compose file syntax that obtains the current target platform as known to bake?

[kipters]

I'd be interested in the same thing.
My use case would be for exporting a separate tarball per each platform.